Mini guide how to extract the public certificate from at SMTP server using TLS
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openssl s_client -connect mail.example.com:25 -starttls smtp |
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Download OpenSSL for windows here: https://slproweb.com/products/Win32OpenSSL.html copy Server certificate section from -----BEGIN CERTIFICATE----- to -----END CERTIFICATE----- and save to a .cer file, and open the file source: https://serverfault.com/questions/131627/how-to-inspect-remote-smtp-servers-tls-certificate |